Non-aqueous electrolyte secondary battery
Abstract
Abstract Translated from Japanese (57)【要約】 【構成】 負極と正極とリチウムイオン導電性の非水電 解質とから少なくとも成る非水電解質二次電池におい て、負極活物質として組成式がLi x SiO y で示さ れ、リチウム含有量xと酸素量yがそれぞれ1.5≦x ≦4、及び0<y<2となる様に規制されたリチウム含 有ケイ素酸化物を用いる。又、より好ましくは、正極活 物質としてCo、Ni、Mn、Fe、V、W、Nb及び Ti等から選ばれた遷移金属酸化物、特にリチウム含有 遷移金属酸化物を有する正極と前記の負極とを組み合わ せて用いる。 【効果】 負極活物質の電位が低く卑であり、金属リチ ウムに対して0〜1Vの卑な電位領域に於ける充放電容 量が大きく、しかも充放電時の分極(内部抵抗)が小さ いため、高電圧高エネルギー密度で且つ大電流充放電特 性に優れると共に、充放電効率が高く、デンドライト生 成による内部短絡等の不良の発生が無く、安定でサイク ル寿命が長く、信頼性の高い二次電池が得られる。 (57) [Summary] [Constitution] In a non-aqueous electrolyte secondary battery comprising at least a negative electrode, a positive electrode and a lithium ion conductive non-aqueous electrolyte, a negative electrode active material is represented by a composition formula of Li x SiO y and contains lithium. Amount x and oxygen amount y are each 1.5 ≦ x A lithium-containing silicon oxide regulated so that ≦ 4 and 0 <y <2 is used. Further, more preferably, the positive electrode having a transition metal oxide selected from Co, Ni, Mn, Fe, V, W, Nb, and Ti as a positive electrode active material, particularly a lithium-containing transition metal oxide, and the above negative electrode. Are used in combination. [Effect] Since the potential of the negative electrode active material is low and base, the charge / discharge capacity is large in a base potential region of 0 to 1 V with respect to metallic lithium, and the polarization (internal resistance) during charge / discharge is small. A high-voltage, high-energy density, high-current charging / discharging characteristic is high, charging / discharging efficiency is high, there is no occurrence of defects such as internal short circuit due to dendrite generation, stable, long cycle life, and a highly reliable secondary battery. can get.
Inventors
- 👤 Kensuke Tawara
- 👤 謙介 田原
- 👤 Fumiharu Iwasaki
- 👤 文晴 岩崎
- 👤 Seiji Yahagi
- 👤 誠治 矢作
- 👤 Akihito Sakata
- 👤 明史 坂田
- 👤 Tsugio Sakai
- 👤 次夫 酒井
- 👤 Hideki Ishikawa
- 👤 英樹 石川
- 👤 Shinichi Takasugi
- 👤 信一 高杉
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